Contrary to the previous selection types,
these three do not require an actual selection afterwards. That's why they leave the selection type unaltered,
nevertheless they perform an implicit logical AND like all the others above.
Examples:
DelMol NucAcid
Delete all nucleic acid molecules
DelAtom CA CB Protein
Delete all atoms named CA or CB and belonging to a protein
DelRes HetGroup
Delete everything that is neither a protein nor a nucleic acid